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The recently published study by Bhavsar and Subramanian1 is described as a case-controlled study; however, this is incorrect. The study participants were selected on the basis of an exposure of interest, that is, central subfield macular thickness and matched with respect to age, sex and duration of diabetes. (It is important to note that the ‘study participants’ are not …
Competing interests None.
Provenance and peer review Not commissioned; not externally peer reviewed.